If you have the computer set to sleep after some time, that's probably what's causing the shut down. My machine was doing the same thing, and then restarting on its own because I'd set the preferences to do that in case of power failure. And then when I'd go to use the computer I'd get a message that there'd been a problem and did I want to report it to Apple. Since I set the preferences never to allow the computer to go to sleep, the problem has disappeared. The HD goes to sleep, as does the monitor, of course.

If you have the computer set to sleep after some time, that's probably what's causing the shut down. My machine was doing the same thing, and then restarting on its own because I'd set the preferences to do that in case of power failure. And then when I'd go to use the computer I'd get a message that there'd been a problem and did I want to report it to Apple. Since I set the preferences never to allow the computer to go to sleep, the problem has disappeared. The HD goes to sleep, as does the monitor, of course.

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